将参数的日期类型转换为linq查询中存储过程的varchar

Question

I have created this stored procedure to filter products by type , category , country , subsidary , date .

 CREATE PROCEDURE [dbo].[FindIncomplete_Products]
     @type nvarchar(250),
     @category nvarchar(250),
     @country nvarchar(250),
     @subsidary nvarchar(250),
     @date datetime
AS
Begin  
    select  [dbo].[AB_Product].[ProductID],
            [dbo].[AB_Product].[ProductTitleEn],
            [dbo].[AB_Product].[ProductTitleAr], 
            [dbo].[AB_Product].[Status],
            [dbo].[AB_ProductType].[ProductTypeNameEn],
            [dbo].[AB_ProductType].[ProductTypeNameAr], 
            [dbo].[AB_ProductTypeCategory].[ProductCategoryNameEn],
            [dbo].[AB_ProductTypeCategory].[ProductCategoryNameAr],
            [dbo].[AB_Subsidary].[SubsidaryNameEn],
            [dbo].[AB_Subsidary].[SubsidaryNameAr],
            [dbo].[AB_Subsidary].[Country]
    from 
        [dbo].[AB_Product]
    inner join 
        [dbo].[AB_ProductType] on [dbo].[AB_ProductType].[ProductTypeID] = [dbo].[AB_Product].[ProductTypeID]
    inner join 
        [dbo].[AB_ProductTypeCategory] on [dbo].[AB_ProductTypeCategory].[ProductCategoryID] = [dbo].[AB_Product].[ProductCategoryID]
    inner join 
        [dbo].[AB_Subsidary] on [dbo].[AB_Subsidary].[SubsidaryID] = [dbo].[AB_Product].[Subsidary_ID]
    WHERE 
       (@type IS NULL OR [dbo].[AB_Product].[ProductTypeID]  LIKE '%' +  @type + '%')
       AND (@category IS NULL OR [dbo].[AB_Product].[ProductCategoryID] LIKE '%' +  @category + '%')
       AND (@country IS NULL OR [dbo].[AB_Subsidary].[Country] LIKE '%' +  @country + '%')
       AND (@subsidary IS NULL OR [dbo].[AB_Product].[Subsidary_ID] LIKE '%' +  @subsidary + '%')
       AND (@date IS NULL OR [dbo].[AB_Product].[CreatedDate] LIKE '%' +  @date + '%')
End

I'm passing the parameter values through LINQ query in my C# controller class. This is that linq query

public ActionResult Program_Search(string type, string category, string country, string subsidary, DateTime? date)
{
     var incomplete_product_result = db.Database.SqlQuery<ProductCollection>("FindIncomplete_Products  @type = {0}, @category = {1}, @country = {2}, @subsidary = {3}, @date = {4}", type, category, country, subsidary, date).ToList();

    return View(incomplete_product_result);
}

Once try to pass parameters by binding with URL like follow

http://localhost:49669/Home/Program_Search?type=002&category=null&subsidary=null&country=null&date=12/12/1889

I'm getting following error

Conversion failed when converting date and/or time from character string.

Answer 1

要解决“数据无法显示”的问题，请检查模型是否存在incomplete_product_result ，该模型当前未绑定到任何模型对象。

Answer 2

Open SSMS (SQL Server Management Studio) and type

EXEC FindIncomplete_Products NULL,NULL,NULL,NULL,'2015-01-01' 

and press F5 and you will get that error, without anything to do with the web front end

This issue is this expression:

'%' +  @date + '%'

You are concatenating a string to a date so it tries to implicitly cast the string to a date, and it certainly cant convert a % to a date.

To fix it, change this line

AND (@date IS NULL OR [dbo].[AB_Product].[CreatedDate] LIKE '%' +  @date + '%')

To this

AND (@date IS NULL OR [dbo].[AB_Product].[CreatedDate] = @date)

in your stored proc

The first line doesn't actually make logical sense. You can't LIKE against a date.

This assumes that there are no further issues in the web code.

How did you create the stored proc if you don't know how to use SSMS?

(This is actually all based on @Bhavek's comment - he noticed it first!)